Laser Forming of Metal Foams

Quadrini, Fabrizio; Bellisario, Denise; Squeo, Erica Anna; Santo, Loredana

doi:10.1002/9781118562857.ch3

Cited by 5 publications

(9 citation statements)

References 35 publications

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“…Its bulk density is 1.44 g/cm 3 , close to the cured resin density. Previous experiments have shown that this resin is suitable to produce shape memory foams by solid‐state foaming. In fact, in shape memory tests, total recovery of initial undeformed shapes is achieved also in multiple storing–recovery cycles.…”

Section: Methodsmentioning

confidence: 99%

“…Tests have been performed using a commercial epoxy resin (3M ScotchkoteTM 206 N) which is the same resin used in the previous foaming experiments on Earth and in Space . The resin is available as an uncured one‐part, heat‐curable, thermosetting epoxy powder with fine grain size.…”

Section: Methodsmentioning

confidence: 99%

“…The internal cylindrical part was colored by adding blue pigments in the resin before compaction. Subsequently, the tablet was foamed in typical conditions: placing in an oven with a metallic mold at 320°C for 8 min . The mold consisted of a metallic tube and a thin aluminum (Al) layer for release.…”

Section: Methodsmentioning

confidence: 99%

“…An experiment (called “I‐FOAM”) was designed and carried out on the International Space Station (ISS) on 22nd of May 2011, during the last mission of the Space Shuttle Endeavour . A small equipment was designed and built to simulate the actuation of simple devices in microgravity conditions: Three different configurations (compression, bending, and torsion) were chosen during the memory step of the foams so as to produce their recovery on ISS . It was found that microgravity does not affect the ability of the foams to recover their shape but it poses limits for the heating‐system design because of the difference in heat transfer on Earth and in orbit .…”

Section: Introductionmentioning

confidence: 99%

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Solid‐state foaming of epoxy resin under hypergravity and simulated microgravity

et al. 2018

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Solid-state foaming of epoxy resins has been performed under simulated microgravity by the random positioning machine (RPM) and under hypergravity by the large diameter centrifuge (LDC). More than 50 tests have been performed in static and dynamic conditions in different experimental configurations. Longitudinal, radial, and volumetric foaming ratios have been extracted from foaming tests, and correlated with the applied gravity conditions. Results show that the gravity vector has two opposite effects; the first on the flow front movement and the second on the contact between the sample and the oven. The second effect seems to be stronger, and the important role of heat transfer is confirmed. Nevertheless, effects related to apply centrifugal forces have been found and discussed, above all in the case of LDC tests. K E Y W O R D Sfoams, processing, thermosets

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid‐state foaming of epoxy resin under hypergravity and simulated microgravity

et al. 2018

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“…The mentioned prototypes were produced by laminating two carbon fiber reinforced prepregs with a shape memory epoxy resin as interlayer. The shape memor y properties of such resin (3M Scotchkote TM 206 N) were already tested in several experimental tests carried out on earth [8] and on orbit [9][10][11]. Also the prepregs matrix was an epoxy resin, but it does not have remarkable shape memory properties.…”

mentioning

confidence: 99%

Frozen Stresses in Shape Memory Polymer Composites

Tedde¹,

Santo²,

Bellisario³

et al. 2018

Mat.Plast.

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Shape Memory Polymer Composites (SMPCs) are a class of smart materials in which the structural properties of long-fiber polymer-matrix composites and the functional behavior of Shape Memory Polymers (SMP) are combined together. In this study, the frozen stresses resulting from fixing a deformed shape have been investigated. Two different samples were manufactured, with and without significant shape memory properties, and a three point flexural test equipment was used in order to fix a deformed shape. The forces and the resulting stresses were measured during the samples deformation and after the shape freezing. The experimental tests have shown that the shape memory sample has a better ability to fix a deformed shape, since its frozen stress is higher in all the tests.

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The experimental investigation of springback and roughness parameters in the three-point forming process using terpolymer punch

Arunkumar¹,

Ravichandran²,

Varatharajulu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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By the application of the three-point metal forming process, copious shapes can be formed. While doing the forming process, various unavoidable sheet metal defects will occur. This paper predominantly emphasizes springback and roughness defects and investigates the effects of these parameters with terpolymer Acrylonitrile Butadiene Styrene (ABS) fiber tool punch. Low-cost tooling and quality part development benefit from fiber tool punch over traditional steel tool punch. The springback and surface roughness are analyzed in the AA6061 sheet using steel and fiber punch in three-point U-bending operations, which are carried out as per ASTM standards. For this purpose, steel and fiber punch with nose diameters of 4, 8, and 12 mm and sheet metals of thicknesses 1 and 2 mm are used. The 8%–10% reduction in springback is achieved in fiber punch than steel punch. Also, the fiber punch offers 10%–47%better surface roughness than the steel punch. As the diameter of the punch increases, the roughness value also increases irrespective of the punch material. The fiber – reinforced ABS punch presents an attractive opportunity to reduce the springback effect and improve the surface quality of the finished product.

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Laser Forming of Metal Foams

Cited by 5 publications

References 35 publications

Solid‐state foaming of epoxy resin under hypergravity and simulated microgravity

Solid‐state foaming of epoxy resin under hypergravity and simulated microgravity

Frozen Stresses in Shape Memory Polymer Composites

The experimental investigation of springback and roughness parameters in the three-point forming process using terpolymer punch

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